ISPConfig 2 is not in active devolopment (for new features). Bugfixing and making compatible with new Linux distributions is given.
I'm not so happy about that, because ISPConfig 2 is easier to use for me and has all functions incl. GUI, what I need for a state-of-the-art software.
IPv6 will not be implemented. But I hope, Falko and Till will reconsider their opinion about that. This is not urgent because of you own IPv4-Range.